ADU Design in Pine Haven, WY

ADU Design in Wyoming: what governs your project

Wyoming has no statewide ADU statute; accessory dwellings are governed by each city's zoning ordinance. Cheyenne, Casper, and Jackson each set their own standards for secondary units.

Energy code

Permitting varies by jurisdiction: typical local rules address size limits relative to the primary home, off-street parking, and standard building permits. Foundation and frost-depth requirements follow the state building code.

Permitting & plan check

Cheyenne, Casper, and larger cities maintain their own building departments; many smaller towns and counties use third-party review or minimal local review. Energy and mineral development projects often move through county-level permitting. Review timelines are generally short outside the busiest jurisdictions.

Good to know

• Western Wyoming near the Teton fault has the state's highest seismic hazard.
• Wyoming DEQ administers the WYPDES discharge program for construction stormwater.
• High winds are a defining structural design driver across Wyoming.

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